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This is implemented by creating a Promise object internally and forwarding the .then() call to it. Any further callbacks passed to future .then() calls will be added as callbacks on the same internal promise object. We also take care of resolving or rejecting the promise if the success/error event of the DOMRequest object has been fired before .then() is called.
230 lines
7.0 KiB
HTML
230 lines
7.0 KiB
HTML
<!DOCTYPE HTML>
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<html>
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<head>
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<title>Test for DOMRequest</title>
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<script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
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<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
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</head>
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<body>
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<p id="display"></p>
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<div id="content" style="display: none">
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</div>
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<pre id="test">
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<script class="testbody" type="application/javascript;version=1.7">
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"use strict";
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var reqserv = SpecialPowers.getDOMRequestService();
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ok("createRequest" in reqserv, "appears to be a service");
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function testBasics() {
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// create a request
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var req = reqserv.createRequest(window);
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ok("result" in req, "request has result");
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ok("error" in req, "request has error");
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ok("onsuccess" in req, "request has onsuccess");
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ok("onerror" in req, "request has onerror");
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ok("readyState" in req, "request has readyState");
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ok("then" in req, "request has then");
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is(req.readyState, "pending", "readyState is pending");
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is(req.result, undefined, "result is undefined");
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is(req.onsuccess, null, "onsuccess is null");
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is(req.onerror, null, "onerror is null");
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runTest();
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}
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function testSuccess() {
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// fire success
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var req = reqserv.createRequest(window);
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var ev = null;
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req.onsuccess = function(e) {
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ev = e;
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}
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var result = null;
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var promise = req.then(function(r) {
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is(r, "my result", "correct result when resolving the promise");
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result = r;
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runTest();
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}, function(e) {
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ok(false, "promise should not be rejected");
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runTest();
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});
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ok(promise instanceof Promise, "then() should return a Promise");
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reqserv.fireSuccess(req, "my result");
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ok(ev, "got success event");
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is(ev.type, "success", "correct type during success");
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is(ev.target, req, "correct target during success");
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is(req.readyState, "done", "correct readyState after success");
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is(req.error, null, "correct error after success");
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is(req.result, "my result", "correct result after success");
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is(result, null, "Promise should not be resolved synchronously");
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}
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function testError() {
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// fire error
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var req = reqserv.createRequest(window);
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var ev = null;
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req.onerror = function(e) {
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ev = e;
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}
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var error = null;
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var promise = req.then(function(r) {
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ok(false, "promise should not be resolved");
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runTest();
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}, function(e) {
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ok(e instanceof DOMError, "got error rejection");
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ok(e === req.error, "got correct error when rejecting the promise");
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error = e;
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runTest();
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});
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ok(promise instanceof Promise, "then() should return a Promise");
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reqserv.fireError(req, "OhMyError");
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ok(ev, "got error event");
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is(ev.type, "error", "correct type during error");
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is(ev.target, req, "correct target during error");
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is(req.readyState, "done", "correct readyState after error");
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is(req.error.name, "OhMyError", "correct error after error");
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is(req.result, undefined, "correct result after error");
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is(error, null, "Promise should not be rejected synchronously");
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}
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function testDetailedError() {
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// fire detailed error
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var req = reqserv.createRequest(window);
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var ev = null;
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req.onerror = function(e) {
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ev = e;
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};
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var error = null;
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var promise = req.then(function(r) {
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ok(false, "promise should not be resolved");
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runTest();
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}, function(e) {
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ok(e instanceof DOMError, "got error rejection");
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ok(e === req.error, "got correct error when rejecting the promise");
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error = e;
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runTest();
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});
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ok(promise instanceof Promise, "then() should return a Promise");
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reqserv.fireDetailedError(req, new DOMError("detailedError"));
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ok(ev, "got error event");
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is(ev.type, "error", "correct type during error");
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is(ev.target, req, "correct target during error");
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is(req.readyState, "done", "correct readyState after error");
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is(req.error.name, "detailedError", "correct error after error");
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is(req.result, undefined, "correct result after error");
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is(error, null, "Promise should not be rejected synchronously");
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}
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function testThenAfterSuccess() {
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// fire success
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var req = reqserv.createRequest(window);
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var ev = null;
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req.onsuccess = function(e) {
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ev = e;
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}
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reqserv.fireSuccess(req, "my result");
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ok(ev, "got success event");
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is(ev.type, "success", "correct type during success");
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is(ev.target, req, "correct target during success");
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is(req.readyState, "done", "correct readyState after success");
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is(req.error, null, "correct error after success");
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is(req.result, "my result", "correct result after success");
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var result = null;
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var promise = req.then(function(r) {
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is(r, "my result", "correct result when resolving the promise");
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result = r;
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runTest();
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}, function(e) {
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ok(false, "promise should not be rejected");
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runTest();
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});
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ok(promise instanceof Promise, "then() should return a Promise");
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is(result, null, "Promise should not be resolved synchronously");
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}
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function testThenAfterError() {
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// fire error
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var req = reqserv.createRequest(window);
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var ev = null;
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req.onerror = function(e) {
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ev = e;
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}
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reqserv.fireError(req, "OhMyError");
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ok(ev, "got error event");
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is(ev.type, "error", "correct type during error");
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is(ev.target, req, "correct target during error");
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is(req.readyState, "done", "correct readyState after error");
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is(req.error.name, "OhMyError", "correct error after error");
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is(req.result, undefined, "correct result after error");
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var error = null;
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var promise = req.then(function(r) {
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ok(false, "promise should not be resolved");
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runTest();
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}, function(e) {
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ok(e instanceof DOMError, "got error rejection");
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ok(e === req.error, "got correct error when rejecting the promise");
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error = e;
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runTest();
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});
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ok(promise instanceof Promise, "then() should return a Promise");
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is(error, null, "Promise should not be rejected synchronously");
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}
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function testDetailedError() {
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// fire detailed error
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var req = reqserv.createRequest(window);
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var ev = null;
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req.onerror = function(e) {
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ev = e;
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};
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var error = null;
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var promise = req.then(function(r) {
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ok(false, "promise should not be resolved");
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runTest();
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}, function(e) {
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ok(e instanceof DOMError, "got error rejection");
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ok(e === req.error, "got correct error when rejecting the promise");
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error = e;
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runTest();
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});
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ok(promise instanceof Promise, "then() should return a Promise");
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reqserv.fireDetailedError(req, new DOMError("detailedError"));
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ok(ev, "got error event");
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is(ev.type, "error", "correct type during error");
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is(ev.target, req, "correct target during error");
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is(req.readyState, "done", "correct readyState after error");
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is(req.error.name, "detailedError", "correct error after error");
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is(req.result, undefined, "correct result after error");
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is(error, null, "Promise should not be rejected synchronously");
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}
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var tests = [
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testBasics,
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testSuccess,
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testError,
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testDetailedError,
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testThenAfterSuccess,
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testThenAfterError,
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];
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function runTest() {
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if (!tests.length) {
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SimpleTest.finish();
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return;
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}
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var test = tests.shift();
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test();
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}
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SimpleTest.waitForExplicitFinish();
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runTest();
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</script>
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</pre>
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</body>
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</html>
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